I have a 2465 (not A or B) that I bought years ago and never really used or knew how to use it. Recently I dragged it out of storage and it blew one of the capacitors. I replaced all of the Rifa caps and one carbon comp resistor that was clearly damaged in the blast. The scope starts up with no errors and I’ve spent a great deal of time in the operators and service manual as well as watching hours of videos. I’m now pretty familiar with the scope’s controls. I also recently scored a BK precision function generator.
What I’m noticing is when measuring voltages on Channel 2 is they read exactly 5x higher on Channel 2 than on Channels 1, 3, or 5.
I have a 50ohm BNC cable connecting my signal generator to my scope inputs. Starting on channel one I set the frequency to 1Khz and the amplitude so that the scope measures it at .1V. Channel 2 will measure that same signal as .5V. I have my V/Div set the same on all 4 channels. I’m triggering on whichever channel the cable is plugged into. All 4 channels measure the frequency correctly as 1Khz.
It seems odd to me that it’s off exactly by a factor of 5. I’m not sure if the vertical calibration is off, there’s a hardware problem, user error or what. Everything else is functioning normally as far as I can tell. I’ve read through the CAL02 procedure several times but haven’t mess with that yet.
I’m using this for tube amp work. I’m mainly interested observing clipping in my sine wave signal and measuring voltages at various points in the signal path. I will rarely have a need for channel 2 anyway. Still I have the itch to fix things when they don’t work.